Crushing and grinding machine



CRUSHING AND GRINDING MACHINE Filed April 16, 1958 VI INVENTOR. CA/PL RJOHNSON.

ATTORNEY.

Patented Aug. 20, 1940 UNETED srrs ii TENT FFECE Carl R. Johnson,Denver, 0010., assignor of fifty per cent to C. E. Cannon, Denver, Colo.

Application April 16, 1938, Serial No. 202,496

1 Claim.

This invention relates to'a crushing and grinding machine and has forits principal object the provision of a crushing and grinding devicewhich will require but a minimum of power; which will grind the materialto a uniform mesh with a minimum formation of fines and slimes; whichwill exert a combined grinding and impacting action upon the material toseparate the crystalline structure thereof, to release the mineralvalues therefrom; and in which the wearing parts can be quickly, easilyand economically removed and replaced.

Other objects and advantages reside in the detail construction of theinvention, which is designed for simplicity, economy, and efficiency.These will become more apparent from the following description.

In the following detailed description of the invention reference is hadto the accompanying drawing which forms a part hereof. Like numeralsrefer to like parts in all views of the drawing and throughout thedescription.

In the drawing:

Fig. 1 is a side view partially in section of one form of the improvedgrinder.

Fig. 2 is a cross section through the grinding wheel.

Fig. 3 illustrates the grinding ball as used in the invention form.

The invention employs two grinding wheels 28 and 29, each cast with asemi-cylindrical, peripheral groove 38. The wheels 28 and 29 are mountedon shafts 3! and 32, respectively, carried in bearings 33 from a framework 34. 05 The wheels 28 and 29 are positioned in alignment with eachother with the rims in close proximity. A single grinding ball 35 restsby gravity in the socket formed by the grooves Si] in the wheels. Theradius of the ball 35 coincides with the radius of the groove 30 so thatthe ball will fit closely into the groove to engage it at all points.

In use, the wheel 28 is driven from any source of power in a directiontoward the ball 35. The wheel 29 need not be driven unless desired. Thematerial to be ground is fed into the top of the wheel 2% from asuitable chute 3ft which exerts an impacting and grinding action thereonto reduce it to the desired mesh.

It is conceivable that an additional grinding wheel could be added tothe right of the idler wheel 29 and an additional ball placed betweenthese wheels. This would double the capacity of the machine with theaddition of a single wheel and ball.

In actual practice, this machine has been found to grind material to avery uniform mesh with the formation of a minimum of fine dustlikematerial. This is probably due to the fact that particles passingbetween the ball and the wheel raise the ball a uniform heightthroughout the line of the grinding face so that all material passingwill be of a uniform size.

While a specific form of the improvement has been described andillustrated herein, it is desired to be understood that the same may bevaried, within the scope of the appended claim, Without departing fromthe spirit of the invention.

Having thus described the invention, What is claimed and desired securedby Letters Patent is:

A crushing and grinding machine comprising: a pair of rotatably mountedgrinding wheels lying in a common vertical plane; a substantiallysemi-circular outwardly facing groove extending around the periphery ofeach grinding wheel; a completely spherical ball supported by said twogrinding wheels and resting by gravity in the two peripheral grooves ofboth wheels; means for feeding material to be ground between saidspherical ball and one of said wheels; and means rotating one of saidwheels so that rotative movement will be imparted to said ball, saidball being free to rotate in any direction.

CARL R1. JOHNSON.

